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Texas Instruments SN74HC151D — Logic ICs

SN74HC151D Multiplexer 1x8:1, 2V-6V, 16-SOIC, Active

MPNSN74HC151D
End of Life

Texas Instruments 74HC series SN74HC151D, 1 x 8:1 multiplexer, single supply 2V to 6V, 7.8mA output high/low, -40°C to 85°C, 16-SOIC package.

$1.16Ref. price · indicative, final on quote
Texas Instruments SN74HC151D datasheet (PDF)
Packaging16-SOIC (0.154", 3.90mm Width)
RoHSROHS3 Compliant
Series74HC
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SN74HC151D specifications
ParameterValue
TypeMultiplexer
Series74HC
MountingSurface Mount
Supply voltage2V ~ 6V
Voltage supply sourceSingle Supply
Current - output high, low7.8mA, 7.8mA
Operating temperature-40°C ~ 85°C
Circuit1 x 8:1
PackageTube
Case16-SOIC (0.154\", 3.90mm Width)
Independent circuits1

Product details

It selects one of eight data sources based on a three-bit address, making it the standard building block for data routing, input expansion, and signal gating in digital systems.

The 2V to 6V supply window means this part works on a 3.3V microcontroller rail or a 5V legacy bus without a level translator. At 3.3V the 7.8mA output high and low current is enough to drive one or two standard CMOS loads or a low-power LED indicator, but it will not fan out to a heavy bus — plan a buffer if the trace runs more than a few centimetres or feeds multiple inputs.

Frequently asked questions

Can the SN74HC151D be used with a 3.3V supply?

Yes. The supply range is 2V to 6V, so 3.3V is well within the operating window. At 3.3V the output high and low current is 7.8mA, which is adequate for driving CMOS logic inputs or a single low-current load.

What is the difference between SN74HC151D and SN74HCT151D?

The SN74HCT151D is the TTL-compatible variant of the same 1 x 8:1 multiplexer. The HC version (this part) operates from 2V to 6V and has CMOS-level input thresholds (0.3 x VCC low, 0.7 x VCC high). The HCT version uses TTL thresholds (0.8V low, 2.0V high) and is intended for mixed-voltage systems where the driving logic is 5V TTL. If your upstream logic is pure 3.3V CMOS, the HC variant is the correct choice.

Is the SN74HC151D compatible with TTL logic levels?

No, not directly. The HC family uses CMOS input thresholds (0.3 x VCC low, 0.7 x VCC high). At 5V supply, the low threshold is 1.5V and the high threshold is 3.5V, which is compatible with 5V TTL outputs (0.8V low, 2.0V high). At 3.3V supply, the high threshold is 2.31V, which is above the 2.0V TTL minimum — so a 5V TTL output driving a 3.3V-powered HC input may not reliably reach the high threshold. For mixed-voltage TTL systems, use the SN74HCT151D instead.